Large Eddy Simulations
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Large Eddy Simulation of Bluff Body Stabilized Turbulent Premixed Flame
ABSTRACT: A turbulent reacting flow in a channel with an obstacle was simulated computationally with large eddy simulation turbulence modeling and the Xi turbulent combustion model for premixed flame. The numerical model was implemented in the open source software OpenFoam. Both inert flow and reactive flow simulations were performed. In the inert flow, comp
J. Aerosp. Technol. Manag.. Publicado em: 2013-06
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2. Simulação computacional de escoamentos reativos com baixo número Mach aplicando técnicas de refinamento adaptativo de malhas / Computational simulation of low Mach number reacting flows applying adaptive mesh refinement techniques.
It is the main goal of the present work to extend a numerical methodology based on both the use of an adaptive mesh refinement technique (AMR) and the use of a multistep, implicit-explicit time-step strategy (IMEX) to applications involving low Mach number reactive flows. Originally developed for incompressible flows, the Eulerian formulation of that methodo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/06/2012
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3. Otimização e dinâmica dos fluidos computacional aplicadas a turbinas eólicas
The present work consists in the application of optimization methods and computational fluid dynamics to wind turbines. The massive growth in renewable energies demands more powerful turbines and more accuracy in their design and analysis. This work has three objectives: optimization of an airfoil for wind turbines, simulation of a wind turbine airfoil in de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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4. Simulação de grandes escalas para análise numérica da esteira aerodinâmica da turbina eólica NREL UAE Phase VI
The Unsteady Aerodynamics Experiment Phase VI, which has been carried out in 2000 by the US National Renewable Energy Laboratory (NREL) at the NASA Ames wind tunnel, has been numerically reproduced. The purpose of this work is to study the characteristics of the wind wake produced by the 10 meter two bladed wind turbine, operating at a constant rotational sp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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5. Modelagem matemática de jatos em desenvolvimento espacial usando a metodologia pseudoespectral de Fourier
A busca por métodos de alta acurácia e alta taxa de convergência com a finalidade de resolver as equações de Navier-Stokes é de grande interesse para estudiosos de CFD. Essa busca é motivada, pois existem fenômenos físicos, como a turbulência nos fluidos, para os quais apenas metodologias que possuem uma alta acurácia permitem obter uma solução
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2011
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6. ESTUDO DOS FLUXOS TURBULENTOS DE CALOR SENSÍVEL E LATENTE NO FUNDO DO VALE DO RIO DA PRATA
Three observational campaigns have been conducted in the region of Nova Roma do Sul, southern Brazil. In the last one of them, a micrometeorological tower was deployed above the river surface, at the bottom of the Prata river valley. The purpose was to characterize the exchange between the river surface and the atmosphere. The micrometeorological parameters
Publicado em: 2008
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7. ESTUDO DO CICLO DIÁRIO DA CAMADA LIMITE PLANETÁRIA ATRAVÉS DA SIMULAÇÃO DOS GRANDES TURBILHÕES / STUDY OF DAILY CYCLE OF PLANETARY BOUNDARY LAYER BY LARGE EDDY SIMULATION
The PBL is the region on the troposphere characterized by existence of turbulence (BUSINGER, 1981). Turbulent flow is that when the fluctuations of the variables that describe the flow are amplified in time and space (LANDAU; LIFSHITZ, 1959). The study of the planetary boundary layer (PBL) through the computational fluid dynamics, particularly the large eddi
Publicado em: 2008
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8. Detailed Two-Dimensional Numerical Analysis of Multiphase Flows / Análise numérica detalhada de escoamentos multifásicos bidimensionais
The mathematical modeling of multiphase flows involves the interaction between deformable and moving geometries with the fluid in which they are dispersed (immersed). This kind of interaction is present in many practical applications. A common approach to handle these problems is the so called Front-Tracking/Front-Capturing Hybrid Methods. This methodology c
Publicado em: 2007
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9. Detailed Two-Dimensional Numerical Analysis of Multiphase Flows / AnÃlise numÃrica detalhada de escoamentos multifÃsicos bidimensionais
The mathematical modeling of multiphase ows involves the interaction between deformable and moving geometries with the uid in which they are dispersed (immersed). This kind of interaction is present in many practical applications. A common approach to handle these problems is the so called Front-Tracking/Front-Capturing Hybrid Methods. This methodology consi
Publicado em: 2007
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10. SIMULAÇÃO DE GRANDES ESCALAS DA BOLHA DE SEPARAÇÃO EM PLACAS FINAS A PEQUENO ÂNGULO DE INCIDÊNCIA / LARGE EDDY SIMULATIONS OF THE THIN PLATE SEPARATION BUBBLE AT SHALLOW INCIDENCE
Escoamentos aerodinâmicos externos sobre membranas e aerofólios finos representam um enorme desafio para simulações numéricas, tendo em vista os diversos e complexos regimes de escoamento presentes, que incluem separa ção da camada limite, transição da camada de mistura para regime turbulento, recolamento, relaminarização da camada limite, e forma
Publicado em: 2006
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11. Simulations of incompressible fluid flows by a least squares finite element method
In this work simulations of incompressible fluid flows have been done by a Least Squares Finite Element Method (LSFEM) using velocity-pressure-vorticity and velocity-pressure-stress formulations, named u-p-omega and u-p-tau formulations respectively. These formulations are preferred because the resulting equations are partial differential equations of first
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-09
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12. MODELO ESPECTRAL DE HEISENBERG APLICADO AO DECAIMENTO DA TURBULÊNCIA NA CAMADA RESIDUAL / SPECTRAL MODEL DE HEISENBERG APPLIED TO THE DECLINE OF THE TURBULENCE IN RESIDUAL LAYER
In the study of the dispersion of contaminants in the atmosphere by computational simulations, the Eulerian approach, based in the diffusionadvection equation, is largely employed. In these simulations, concentration values are calculated at each point of a fixed grid in space and time and for this to be done it is necessary to determine an appropriated eddy
Publicado em: 2005